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A Study on Signal Analysis of the Data Aquisition System for Photosensor

Other Titles
 데이터 획득장치에 이용되는 포토센서에 대한 DAS의 신호분석연구 
Authors
 I. H. Hwang  ;  S. K. Yoo 
Citation
 Journal of Rehabilitation Welfare Engineering & Assistive Technology (재활복지공학회논문지), Vol.10(3) : 237-242, 2016 
Journal Title
 Journal of Rehabilitation Welfare Engineering & Assistive Technology (재활복지공학회논문지) 
ISSN
 1976-7102 
Issue Date
2016
Keywords
Signal Analysis ; Photo detector ; Switched integrator ; ADC ; SNR
Abstract
The major advantage of slip-ring technology in Spiral CT is that it facilitates continuous rotation of the x-ray tube, so that volume data can be acquired from a patient quickly. Not only for such a fast scan, but also for the dose reduction purpose, high signal-to-noise ratio and fast data acquisition system is required. In this study, we have built a multi-channel photodetector and multi-channel data acquisition system for CT application. The detector module consisted of CdWO4 crystal and Si photodiode in 16 channels. For the performance test of the preamplifier stage, both the transimpedance and switched integrator types are optimized for the photodetector modules. Switched integrator showed better noise performance in the limited bandwidth which is suitable for the current CT application. The control sequence for data acquisition and 20 bit ADC is designed with VHDL(Very High Speed Integrated Circuit Hardware Description Language) and implemented on FPGA(Field Programmable Gate Array) chip. Our Si photodiode detector module coupled to CdWO4 crystal showed comparable signal with other commercially available photodiode for CT. Switched integrator type showed higher SNR but narrower bandwidth compared to transimpedance preamplifier. Digital hardware is designed by FPGA, so that the control signal could be redesigned without hardware alteration.
Files in This Item:
T201604357.pdf Download
DOI
10.21288/resko.2016.10.3.237
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Medical Engineering (의학공학교실) > 1. Journal Papers
Yonsei Authors
Yoo, Sun Kook(유선국) ORCID logo https://orcid.org/0000-0002-6032-4686
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/152410
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